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CVE-2021-28711

Published: 5 January 2022

Rogue backends can cause DoS of guests via high frequency events T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Xen offers the ability to run PV backends in regular unprivileged guests, typically referred to as "driver domains". Running PV backends in driver domains has one primary security advantage: if a driver domain gets compromised, it doesn't have the privileges to take over the system. However, a malicious driver domain could try to attack other guests via sending events at a high frequency leading to a Denial of Service in the guest due to trying to service interrupts for elongated amounts of time. There are three affected backends: * blkfront patch 1, CVE-2021-28711 * netfront patch 2, CVE-2021-28712 * hvc_xen (console) patch 3, CVE-2021-28713

From the Ubuntu security team

Jürgen Groß discovered that the Xen subsystem within the Linux kernel did not adequately limit the number of events driver domains (unprivileged PV backends) could send to other guest VMs. An attacker in a driver domain could use this to cause a denial of service in other guest VMs.

Priority

Low

CVSS 3 base score: 6.5

Status

Package Release Status
linux-gcp-5.13
Launchpad, Ubuntu, Debian
focal
Released (5.13.0-1021.25~20.04.1)
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-gkeop
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1037.38)
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-gkeop-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1037.38~18.04.1)
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-hwe-5.13
Launchpad, Ubuntu, Debian
focal
Released (5.13.0-37.42~20.04.1)
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-hwe-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-105.119~18.04.1)
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-ibm
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1018.20)
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-1002.2)
linux-ibm-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1018.20~18.04.1)
trusty Does not exist

xenial Does not exist

focal Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
impish
Released (5.13.0-1018.19)
trusty Does not exist

hirsute Ignored
(reached end-of-life)
xenial Ignored
(was needed ESM criteria)
upstream
Released (5.16~rc7)
bionic
Released (4.15.0-1107.109)
focal
Released (5.4.0-1059.62)
jammy Not vulnerable
(5.15.0-1002.2)
linux-oracle
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1067.72)
impish
Released (5.13.0-1023.28)
trusty Does not exist

hirsute Ignored
(reached end-of-life)
xenial
Released (4.15.0-1087.95~16.04.1)
upstream
Released (5.16~rc7)
bionic
Released (4.15.0-1087.95)
jammy Not vulnerable
(5.15.0-1001.3)
linux-oracle-5.13
Launchpad, Ubuntu, Debian
focal
Released (5.13.0-1025.30~20.04.1)
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-azure-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal
Released (5.13.0-1021.24~20.04.1)
impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-raspi
Launchpad, Ubuntu, Debian
focal
Released (5.4.0-1056.63)
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Ignored
(reached end-of-life)
upstream
Released (5.16~rc7)
impish
Released (5.13.0-1022.24)
jammy Not vulnerable
(5.15.0-1002.2)
linux-raspi-5.4
Launchpad, Ubuntu, Debian
bionic
Released (5.4.0-1056.63~18.04.1)
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux
Launchpad, Ubuntu, Debian
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
bionic
Released (4.15.0-169.177)
focal
Released (5.4.0-105.119)
hirsute Ignored
(reached end-of-life)
impish
Released (5.13.0-37.42)
upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-17.17)
linux-hwe
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Ignored
(replaced by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

xenial
Released (4.15.0-169.177~16.04.1)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-hwe-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-hwe-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Ignored
(superseded by linux-hwe)
bionic Ignored
(superseded by linux-hwe-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
xenial Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1121.129)
focal
Released (5.4.0-1069.73)
hirsute Ignored
(reached end-of-life)
trusty Ignored
(was needed ESM criteria)
xenial Ignored
(was needed ESM criteria)
impish
Released (5.13.0-1019.21)
upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-1002.4)
linux-aws-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-aws-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-aws-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic
Released (5.4.0-1069.73~18.04.1)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was pending [5.11.0-1029.32~20.04.1] now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

xenial
Released (4.15.0-1120.128~16.04.1)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-azure
Launchpad, Ubuntu, Debian
bionic Ignored
(superseded by linux-azure-5.3)
hirsute Ignored
(reached end-of-life)
trusty
Released (4.15.0-1131.144~14.04.1)
xenial
Released (4.15.0-1131.144~16.04.1)
focal
Released (5.4.0-1073.76)
impish
Released (5.13.0-1021.24)
upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-1001.2)
linux-azure-4.15
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (4.15.0-1131.144)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-azure-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-azure-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-azure-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (5.4.0-1073.76~18.04.1)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-azure-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-azure-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was pending [5.11.0-1029.32~20.04.2] now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-bluefield
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal
Released (5.4.0-1032.35)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-dell300x
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
bionic
Released (4.15.0-1035.40)
jammy Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-azure-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Ignored
(superseded by linux-gcp-5.3)
hirsute Ignored
(reached end-of-life)
xenial
Released (4.15.0-1116.130~16.04.1)
focal
Released (5.4.0-1068.72)
impish
Released (5.13.0-1021.25)
upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-1001.3)
linux-gcp-4.15
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
bionic
Released (4.15.0-1116.130)
jammy Does not exist

linux-gcp-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-gcp-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-gcp-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (5.4.0-1068.72~18.04.1)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-gcp-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-gcp-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
focal Ignored
(was pending [5.11.0-1030.34~20.04.3] now end-of-life)
jammy Does not exist

linux-gke
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Ignored
(reached end of standard support)
bionic Does not exist

focal
Released (5.4.0-1066.69)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-1002.2)
linux-gke-4.15
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-gke-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic
Released (5.4.0-1066.69~18.04.1)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-intel-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-oracle-5.0
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-oracle-5.3)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Ignored
(superseded by linux-oracle-5.4)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-oracle-5.4
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
bionic
Released (5.4.0-1067.72~18.04.1)
jammy Does not exist

linux-oracle-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-oracle-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
focal Ignored
(was pending [5.11.0-1029.32~20.04.1] now end-of-life)
jammy Does not exist

linux-oem
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Ignored
(superseded by linux-hwe)
bionic Ignored
(was needs-triage now end-of-life)
focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-oem-5.6
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-oem-5.10
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needed now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-oem-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needed now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-oem-5.14
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

hirsute Does not exist

impish Does not exist

focal Needed

upstream
Released (5.16~rc7)
jammy Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
trusty Does not exist

focal Ignored
(replaced by linux-raspi)
hirsute Does not exist

impish Does not exist

xenial Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
bionic
Released (4.15.0-1103.110)
jammy Does not exist

linux-raspi2-5.3
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

bionic Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-riscv
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(superseded by linux-riscv-5.8)
hirsute Ignored
(reached end-of-life)
impish
Released (5.13.0-1017.19)
upstream
Released (5.16~rc7)
jammy Not vulnerable
(5.15.0-1004.4)
linux-riscv-5.8
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was needs-triage now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-riscv-5.11
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Ignored
(was pending [5.11.0-1030.34] now end-of-life)
hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic
Released (4.15.0-1120.129)
focal Does not exist

hirsute Does not exist

impish Does not exist

xenial Ignored
(was needs-triage now end-of-life)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-aws-5.13
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

impish Does not exist

focal
Released (5.13.0-1019.21~20.04.1)
upstream
Released (5.16~rc7)
jammy Does not exist

linux-fips
Launchpad, Ubuntu, Debian
trusty Does not exist

bionic Does not exist

focal Does not exist

hirsute Does not exist

impish Does not exist

upstream
Released (5.16~rc7)
xenial Ignored
(was needed ESM criteria)
jammy Does not exist

linux-azure-fde
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Needed

impish Does not exist

upstream
Released (5.16~rc7)
jammy Does not exist

linux-lowlatency
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage

linux-oem-5.17
Launchpad, Ubuntu, Debian
trusty Does not exist

xenial Does not exist

bionic Does not exist

focal Does not exist

impish Does not exist

jammy Not vulnerable

upstream Needs triage